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He revealed Mr Hall has a "chequered history" and has relationships with people who are known to police - but did not go into detail about his past.

"Although we don't know yet whether a crime has been committed it is prudent for us to operate as if we were dealing with a homicide. We do not want to get two weeks or two months down the track, find out that some harm has come to Mr Hall, and then have to try and back capture a wealth of information,"

Since Wednesday about 20 police and volunteer Land Search and Rescue personnel have been scouring a 16sq km area for Mr Hall, who is described as caucasian, 1.82m tall and of medium build.

It was thought Mr Hall was still on his lifestyle block after police found a caravan on the property unlocked, with his vehicle and quad bike nearby.

The possibility he has been lost or injured hunting has not been ruled out, Mr Kirby said.

However, search and rescue teams would have expected to have found some trace of him by now if that was the case, he said.

Police want to hear from anyone who had seen Mr Hall or his 2004 Toyota Hilux, which was red double cab vehicle with a white canopy, in the past week or two.

It is possible some friends may still know Mr Hall by his former nickname 'Jimmy', police said.